The difference between precision bearings and plain bearings

precision bearing and plain bearings should distinguish between the following points:
1, the value is not the same size requirements, high level of accuracy of the product of its size deviation (inner diameter, outer diameter, oval, etc.) than the required accuracy level low product value is smaller;
2, the rotation accuracy required value is not the same, high level of accuracy of the product of its rotational accuracy (internal radial runout, diameter runout, the end face of the raceway beating) the lower level of precision than the value of the product requirements to bearing manufacturers;
3, the surface shape and surface quality requirement value is not the same, high level of accuracy of the products in which the surface shape and surface quality (or channel raceway surface roughness deviation from circular, groove-shaped deviation) than the low level of precision the value to be strict product requirements;
4, precision grade products which are particularly high accuracy grade material than the average material properties of the product is more favorable.
Under normal circumstances, the accuracy of the finished grade rolling into the following six levels (from low to high): 0; 6; 6X; 5; 4; 2